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There are 20 known radioisotopes ranging in atomic mass from 241 Fm to 260 Fm (260 Fm is unconfirmed), and 4 nuclear isomers, 247m Fm, 250m Fm, 251m Fm, and 253m Fm. The longest-lived isotope is 257 Fm with a half-life of 100.5 days, and the longest-lived isomer is 247m Fm with a half-life of 5.1 seconds.
For example, both the NaCl structure (space group Fm 3 m) and diamond (space group Fd 3 m) have the same Pearson symbol cF8. Due to this constraint, the Pearson symbol should only be used to designate simple structures (elements, some binary compound) where the number of atoms per unit cell equals, ideally, the number of translationally ...
PuO 2 crystallizes in the fluorite motif, with the Pu 4+ centers organized in a face-centered cubic array and oxide ions occupying tetrahedral holes. [3] PuO 2 owes its utility as a nuclear fuel to the fact that vacancies in the octahedral holes allows room for fission products. In nuclear fission, one atom of plutonium splits into two.
TNT equivalent is a convention for expressing energy, typically used to describe the energy released in an explosion.The ton of TNT is a unit of energy defined by convention to be 4.184 gigajoules (1 gigacalorie), [1] which is the approximate energy released in the detonation of a metric ton (1,000 kilograms) of TNT.
Growing evidence that air pollution—even when experienced at very low levels—hurts human health, led the WHO to revise its guideline (from 10 μg/m 3 to 5 μg/m 3) for what it considers a safe level of exposure of particulate pollution, bringing most of the world—97.3 percent of the global population—into the unsafe zone.
In service since 1977, it is named after the Republic P-47 Thunderbolt, but is commonly referred to as the "Warthog" or simply "Hog". [3] The A-10 was designed to provide close air support (CAS) to ground troops by attacking enemy armored vehicles, tanks, and other ground forces; it is the only production-built aircraft designed solely for CAS ...
The D-30 also replaced the remaining 76 mm (3.0 in) M1942 guns in motor rifle regiments. Military requirements that led to the D-30 can only be deduced. Its role supporting tank and motor rifle regiments, and Soviet doctrine from the Great Patriotic War , suggest that while indirect fire was the primary role, direct fire anti-tank was very ...
The cloth tab is a teal blue colored arc tab 3 + 1 ⁄ 4 inches (8.3 cm) in length and 11 ⁄ 16 inch (1.7 cm) in height overall, the designation "SPECIAL FORCES" in gold-yellow letters 5 ⁄ 16 inch (0.79 cm) in height and is worn on the left sleeve of utility uniforms above a unit's Shoulder Sleeve Insignia and below the President's Hundred ...